NUT, WHIZ-LOC, SS, 1/4-20. Used to attach Truss Dock Leg Retainer (PN96144) to Truss dock. Also used in DockStairs, Canoe Rack's, Kayak Rack, Telescopic Deep Water Brace, Lifting Kit, Kayak Rack, Kayak Stabilizer, and Roller Ramp's.